"One of my several skill sets (I really hate that term, it harkens to nursery school!), is commissioning. By day I am an HVAC design engineer and PM but oversee projects from conception to completion, so it comes with the territory.
My side work is…"
"All good points and refinements, Tedkidd- and by the way, call me Brad. And yes, I am a confirmed wet-head but also a dry-head on commercial/institutional projects more than residential.
Anyway, agreed that the business is moving BTUs and not to put…"
"Agreed, the loss is relatively constant (save for the differences in temperature, narrowing during milder weather and widening with cold, thank you).
As you note, improper sizing coupled with poor duct locations are often existing conditions with no…"
"I see now what you mean.
Agreed that installing any ductwork outside the thermal boundary unnecessarily, should be avoided.
But to take this a step further and by the numbers, code minimum for insulation on ductwork outside the thermal…"
"I can offer some empirical information, general and highly variable, but borne out with regularity.
The "cycles per hour" metric we understand is applicable to on-off equipment of fixed capacity; at best and often rarely it is most closely…"
"To Daniel Cullen-
I agree, solid article. Also am in total agreement regarding low hanging fruit. No sense in fine tuning the hydrodynamics of an ocean liner with a gash below the waterline.
When doing a typical energy audit (blower door test…"
"I agree with Kevin regarding the need for mechanical ventilation vs. relying on passive, uncontrolled ventilation though places you do not ask about in polite company.
That aside, Venmar, Lifebreath, Fantech are, depending on model, fairly…"
"Looks to me like the top of a steam relief vent used to terminate the top of the vent pipe from a boiler feed unit receiver or pressure relief valve. The top was designed with a drain you can see on the side, this kept it clear of ice. The bulb top…"
"I am partial to the Elite software line. I use their CHVAC for my commercial and institutional work but have not used their RHVAC residential/Manual J based product. The interface takes getting used to, not as "clean" as the types that…"
HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part of home energy use, understanding HVAC is critical.See More
The Energy Conservatory (The Minneapolis Blower Door Folks), have software primarily related to building enclosure testing, specifically Tectite (which automates their blower door testing and is sold with the package), plus…"
"What about the standbys such as HAP or EQuest? And to what purpose will these energy models be used? If for rebate and specifically tax credit eligibility, the IRS publishes a list of those they will accept, at least for commercial projects. The…"